G460 does not wakes up from sleep but no display

I have bought a Lenovo G460 about a month a go. I have set it on High Performance power plan through Lenovo energy managment.

When ever the system goes to sleep in balanced power plan, after i try to being it to wake the screen stays blank, though hard disk keeps running and all other lights come up. So i put it on performance mode, which only switches off the display. But even then the same problem remains.

System Config

Processor: iCore 3 2.16 GHz

Video: NVidia 310M

Ram: 4 GB

OS: Win 7 HP 64 bit

Nvidia Driver Version: 188.88

Tried with NVidia latest drivers(256.88) but the problem remains. Tried bios update yesterday and update was very successful but still the problem remains.

Re: G460 does not wakes up from sleep but no display

I dont think it is a Windows 7 issue. I have used a lot of different Win 7 laptops, like the one I get from work, and it does revive fine. I think this issue is related to some driver and may be the video driver may be the culprit. Or atmost may be the wireless driver.